Machine tool



FIG. 1 is a perspective front view of a machine tool showing our new and ornamental design,

FIG. 2 is a front view thereof,

FIG. 3 is a rear view thereof,

FIG. 4 is a top view thereof,

FIG. 5 is a bottom view thereof,

FIG. 6 is a left side view thereof; and,

FIG. 7 is a right side view thereof. 

The ornamental design for a machine tool, as shown and described. 